'High alert' on the baths, those invisible currents that trap the bathers

An urgent warning has been issued along the Atlantic coast of France due to the presence of dangerous underwater currents known as "baïnes." These natural phenomena, which can trap swimmers and lead to drowning, have prompted authorities to raise the alert level to its highest possible status in the region of Nouvelle-Aquatine. The situation comes amid concerns over rising numbers of drownings during the summer season, with more than 90 deaths already recorded since June 19. As school holidays approach, officials are urging extreme caution on coastal areas where these hidden currents pose significant risks. The phenomenon of baïnes is particularly prevalent along the coastline of Gironde, where the landscape features numerous shallow depressions filled with water during low tide. These depressions are often surrounded by sandbanks, and a narrow channel typically cuts through them, leading towards the open sea. This configuration creates powerful undercurrents that pull swimmers away from the shore, sometimes with such force that individuals can be drawn into deeper waters before they even realize the danger. Bruno Castelle, an oceanographer and research director at the CNRS university in Bordeaux, explains that these currents can form and dissipate throughout the day depending on wave activity. He emphasizes that the unpredictable nature of baïnes makes them especially hazardous for swimmers who might not notice the subtle signs of their presence until it's too late. The currents are strongest when waves are high and can suddenly appear without warning, making it difficult for even experienced swimmers to navigate safely. Authorities in Nouvelle-Aquitaine have taken swift action to address the growing concern. Prefect Sophie Brocas has called for heightened vigilance among beachgoers and local communities. Signs have been placed at popular beaches to warn visitors about the dangers associated with baïnes. Additionally, lifeguards have been instructed to monitor the waters more closely and provide immediate assistance should anyone find themselves caught in one of these currents. Local emergency services have also been put on standby to respond quickly to any incidents. The issue of baïnes is not new, but the recent increase in drownings has brought renewed attention to the need for public awareness and education. Many coastal towns have implemented measures to mark areas where baïnes are commonly found, using flags or other visual indicators to alert swimmers. However, experts stress that these precautions must be accompanied by ongoing efforts to educate the public about the risks and how to recognize early warning signs. As the summer season progresses, the focus will remain on ensuring the safety of those visiting the coast. Authorities are working closely with meteorological services to track changes in weather patterns that could influence the formation and strength of baïnes. They are also considering additional measures, such as increased patrols and improved signage, to further reduce the risk of accidents. Public campaigns aimed at raising awareness about the dangers of these currents are being planned, with the goal of reaching both residents and tourists alike. Looking ahead, the emphasis will be on maintaining the current alert levels while continuing to develop strategies to mitigate the risks posed by baïnes. Researchers like Bruno Castelle are collaborating with local authorities to study the behavior of these currents in greater detail, hoping to improve predictive models that can help forecast their occurrence more accurately. Their work aims to inform future policies and interventions designed to protect swimmers and prevent tragedies from occurring in the first place.